At the start, flip the switch behind you to lower the bars in front of you, then ride the lift down. Turn right and enter the teleporter to the left. You'll reach a random place inside the structure. Make your way towards the top to find the red key on a platform in the middle with an arrow on the floor pointing to it. Wait for the plaform to lower then jump to it and collect the key. Drop down to the stairs in front and keep going forward. Once you reach the last step before the pillar drop down to your right and continue straight ahead to spot a switch to your left. Press it and wait for the wall in front to lower. Once it's finished, go up the stairs ahead and use the switch to the left to lower the lift. Ride it to the top, go forward and enter the exit teleporter.

On the top floor of the structure, there's a vaguely cross shaped platform on the west side. Move towards the edge, then slowly drop down to the left and then to the right to collect a supercharge. (sector 97)

Once you are at the red key platform, drop down to the west side, then face north and run towards the wall to land on a platform containing a megaarmor. (sector 101)